UMLGen

What UMLGen is

UMLGen is a browser-based diagramming tool that turns plain-English descriptions of systems into UML, ER, or EER diagrams. Its engine reads the text, identifies relationships, and renders a diagram without requiring special syntax. Supported types are Use Case, Class, Sequence, Activity, Deployment, ER, and EER, covering behavioral, structural, process, deployment, and data models. You can change the source description and regenerate the result, or build a diagram from scratch in the editor. Completed diagrams download as high-resolution PNG images. UMLGen runs on desktop, tablet, and mobile browsers, and requires no installation, plugin, or IDE. The site says no signup or login is needed. Core diagramming features are described as free forever, with no export limits. The Free plan is priced at $0 and includes text-to-diagram generation, the design-from-scratch editor, and PNG export. UMLGen is aimed at software developers, students and academics, and software architects who need a quick web-based way to create and revise the listed diagram formats.

Who it suits

UMLGen suits developers and software architects who want text-driven UML, ER, or EER modeling in a browser. Students and academics can use its editor and PNG export without installing software or creating an account.

Limits

The Free plan includes the listed text-to-diagram generation, editor, and PNG export, with core features described as free forever and no export limits.

Getting started

1. Open UMLGen in a desktop, tablet, or mobile browser
2. Enter a plain-English system description
3. Generate a supported UML, ER, or EER diagram
4. Edit the text and regenerate when changes are needed
5. Use the editor to create a diagram from scratch
6. Download the result as a high-resolution PNG

Verdict

Choose UMLGen if you want free, accountless diagram creation from plain-language descriptions or an in-browser editor. Consider another tool when you need formats or workflows beyond its listed diagram types and PNG export.